lf the fundamental period of function f(...

lf the fundamental period of function `f(x)=sinx + cos(sqrt(4-a^2))x` is `4pi`, then the value of a is/are (a)`sqrt(15)/2`(b)`-sqrt(15)/2`(c)-sqrt(7)/2`(d)`sqrt(7)/2`

A

`sqrt(15)/2`

B

`-sqrt(15)/2`

C

`sqrt(7)/2`

D

`-sqrt(7)/2`

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The correct Answer is:

A, B, C, D

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